payManaCost

Sent while the player pays a spell or ability’s mana cost interactively — tapping lands, activating mana abilities, spending from the floating pool, or paying alternative costs such as delve. Every available step is one entry in actions; the client sends incremental actions by echoing an entry’s id and the engine re-sends an updated payManaCost prompt until the cost is met, then the client sends a final pay.

Arguments

input.type is "payManaCost". The remaining fields:

TypeScript

interface PayManaCostInput {
  cardId: string;
  cardName: string;
  manaCost: string;
  canConfirmFromPool: boolean;
  actions: Array<AvailableAction>;
  description?: string;
}

Rust

#[serde(rename_all = "camelCase")]
pub struct PayManaCostInput {
    pub card_id: String,
    pub card_name: String,
    pub mana_cost: String,
    pub can_confirm_from_pool: bool,
    pub actions: Vec<AvailableAction>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub description: Option<String>,
}

References: AvailableAction

Response

type PayManaCostOutput =
  | { type: "act"; actionId: string }
  | { type: "pay"; auto: boolean }
  | { type: "payLife" }
  | { type: "cancel" };

Send { type: "act", actionId } with the id of an entry in actions to take an incremental step — tapping a mana source, untapping one (undoMana), or delving/un-delving a graveyard card — and the engine answers with an updated payManaCost prompt. The client never builds an actionId; it only echoes one the prompt offered. Send { type: "pay", auto } to finalize (auto: true lets the engine auto-tap the remaining sources), payLife to pay a Phyrexian cost with life, or cancel to back out of the payment entirely.

Example

{
  "promptId": 7,
  "decidingPlayerId": "player-0",
  "input": {
    "type": "payManaCost",
    "cardId": "stack-3",
    "cardName": "Cryptic Command",
    "manaCost": "{1}{U}{U}{U}",
    "canConfirmFromPool": false,
    "actions": [
      {
        "id": "tap:perm-9:0",
        "type": "activateAbility",
        "cardId": "perm-9",
        "abilityIndex": 0,
        "description": "{T}: Add {U}.",
        "isManaAbility": true,
        "producedMana": [{ "color": "U", "amount": 1 }]
      }
    ]
  }
}

{
  "promptId": 7,
  "output": { "type": "act", "actionId": "tap:perm-9:0" }
}